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- W2989494051 abstract "The common belief that glass structure is completely frozen-in at room temperature is challenged at both macroscopic and atomic scales. Here, we demonstrate an analytical method to elucidate the fine details of a continuous structural change of fused silica (FS) at temperatures below the glass-transition temperature using in-situ neutron total scattering. We find that the SiO4 tetrahedron expands through the entire temperature range with a local coefficient of thermal expansion of 9.1 × 10−6 K−1, while the average medium-range distance, derived from the first sharp diffraction peak of the structure factor, expands at a rate of 21 × 10−6 K−1. Such an expansion difference reflects glass-structure changes within the “rigid-unit mode” model, where each tetrahedron behaves as a rigid unit and the flexible rotations between rigid units lead to more than two times higher medium-range thermal expansion. We further demonstrate that such rotations change the shape of individual rings, leading to a measurable change in the first sharp diffraction peak (FSDP). This study paves the way to measure the structural changes of other silicate glasses, especially through the glass transition." @default.
- W2989494051 created "2019-11-22" @default.
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- W2989494051 date "2020-01-01" @default.
- W2989494051 modified "2023-10-18" @default.
- W2989494051 title "Structural evolution of fused silica below the glass-transition temperature revealed by in-situ neutron total scattering" @default.
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- W2989494051 doi "https://doi.org/10.1016/j.jnoncrysol.2019.119760" @default.
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